Chemically polished polycrystalline alumina material

Details Chemically polished polycrystalline alumina material Chemically polished polycrystalline alumina material

1974-03-22

1976-01-27

Mullins, James B.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313221, H01J 1716

Patent

active

039354954

ABSTRACT:
Increased optical transmission is provided for a body of light transmissive polycrystalline alumina body treated at elevated temperatures with a molten flux composition. A tube of the flux polished material which can be used as the light transmissive envelope for high intensity discharge lamps especially sodium vapor lamps, improves light output from the lamp as the result of increased in-line transmission for the treated envelope member. A method of chemically polishing polycrystalline alumina material in this manner is also disclosed.

REFERENCES:
patent: 2901646 (1959-08-01), Plagge et al.
patent: 3567472 (1971-03-01), Bratton
patent: 3708710 (1973-01-01), Smyser et al.
patent: 3723790 (1973-03-01), Dumbaugh, Jr. et al.
patent: 3833399 (1974-09-01), Martyn et al.

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